Image forming apparatus
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Example
First Embodiment
[0033]A structure of an image forming apparatus 100 according to the present invention in a first embodiment will be described with reference to FIGS. 1 to 5.
[0034]The structure of the image forming apparatus 100 including an intermediary transfer belt 12a will be described. FIG. 1 is a sectional view showing the structure of the image forming apparatus 100 including the intermediary transfer belt 12a. The image forming apparatus 100 is an example of a color laser printer. The image forming apparatus 100 shown in FIG. 1 includes four (plurality of) photosensitive drums 1Y, 1M, 1C and 1K as image bearing members corresponding to colors of yellow (Y), magenta (M), cyan (C) and black (K), respectively. Incidentally, for convenience of explanation, description is made using the photosensitive drum 1 representing the photosensitive drums 1Y, 1M, 1C and 1K in some cases. This is true for other image forming process means.
[0035]Each photosensitive drum 1 is rotationally dri...
Example
Second Embodiment
[0140]Next, by using FIGS. 6 to 9, a structure of an image forming apparatus 100 according to the present invention in a second embodiment will be described. Incidentally, constituent elements similar to those in the first embodiment described above are represented by the same reference numerals or symbols or by different reference numerals or symbols in some instances, and will be omitted from description. Part (a) of FIG. 6 is a sectional view showing a structure of a drive transmission device 28 for the intermediary transfer belt 12a in this embodiment, and part (b) of FIG. 6 is an enlarged view of a portion G shown in part (a) of FIG. 6. Part (a) of FIG. 7 is an illustration of a relationship between rotation non-uniformity of a driving roller gear 29 alone and each primary transfer position 27 in this embodiment, and part (b) of FIG. 7 is an illustration of a relationship between rotation non-uniformity of a driving roller pre-stage gear alone and each primary ...
Example
Third Embodiment
[0175]Next, by using FIGS. 10 to 12, a structure of an image forming apparatus 100 according to the present invention in a third embodiment will be described. Incidentally, constituent elements similar to those in the respective embodiments described above are represented by the same reference numerals or symbols or by different reference numerals or symbols in some instances, and will be omitted from description.
[0176]Part (a) of FIG. 10 is a sectional view showing a structure of a drive transmission device 28 for the intermediary transfer belt 12a in this embodiment, and part (b) of FIG. 10 is an enlarged view of a portion G shown in part (a) of FIG. 10. Part (a) of FIG. 11 is an illustration of a relationship between rotation non-uniformity of a driving roller gear 29 alone and each primary transfer position 27 in this embodiment. Part (b) of FIG. 11 is an illustration of a relationship between rotation non-uniformity of a motor gear 30 alone and each primary tran...
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